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Light emitting apparatus and electronic apparatus

a technology of light emitting apparatus and electronic equipment, which is applied in the direction of electrical equipment, thermoelectric device junction materials, and semiconductor devices, etc., can solve the problems of color reproductivity deterioration, brightness reduction, and cost increase, and achieve good display with a wide color gamut

Inactive Publication Date: 2015-03-05
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention describes a light emitting apparatus that combines an organic EL device and a resonance structure to improve color reproductivity without using a color filter. The apparatus adjusts the optical path length to enhance color purity and manufacturability, and uses a resonance peak wavelength to enhance the color purity of the red pixel by reducing the extracted short wavelength component. The results show that the light emitting apparatus has improved color reproductivity without using a color filter.

Problems solved by technology

Also, in the resonance structure alone, the color purity is insufficient and it is not possible to realize a display having good color reproductivity, and thus a color filter may be added (for example, Japanese Patent No. 4403399).
Therefore, when a color filter is not used, the color reproductivity is deteriorated.
Also, even if a color filter is added in order to remove a blue component on the short wavelength side, when compared with a case in which only red light is output, it is necessary to form a color filter having a thick film thickness, and the brightness may decrease, or the cost may increase.

Method used

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  • Light emitting apparatus and electronic apparatus
  • Light emitting apparatus and electronic apparatus
  • Light emitting apparatus and electronic apparatus

Examples

Experimental program
Comparison scheme
Effect test

modification example

D: Modification Example

[0082]The invention is not limited to the embodiments described above, and various modifications described below are possible. Also, it is obvious that respective modifications and embodiments may be appropriately combined.

modification example 1

1. Modification Example 1

[0083]In the embodiment as described above, an example of not using a color filter is described, but it may be configured so that a color filter is formed. If a color filter for a red pixel has transmittance of a short wavelength component is to be high to a certain degree, broad color purity can be realized by using the light emitting apparatus according to the invention as described above. As a result, it is possible to expand the selection scope of the color filter material. Also, it is possible to cause the film thickness of the color filter to be thin.

modification example 2

2. Modification Example 2

[0084]Since the sharpness of the resonance peak waveform changes according to the reflectivity or the film thickness of the counter electrode 20 as a translucent transflective layer, how much the resonance peak wavelength λSC on the short wavelength side is to be decreased more than the light emitting peak wavelength λSIN inside the light emitting function layer may be determined according to the sharpness.

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PUM

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Abstract

In the light emitting apparatus having a resonance structure for adjusting an optical path length between the reflecting layer and the translucent reflecting layer, in which the emitting layer performs internal luminescence on a first wavelength region and a second wavelength region on a short wavelength side with respect to the first wavelength region, in the second wavelength region, a light emitting peak wavelength, a resonance peak wavelength, and an output wavelength satisfy a relationship of the light emitting peak wavelength>the output wavelength>the resonance peak wavelength, and film thicknesses of an array cavity layer and the emitting layer are adjusted so that an emission intensity of the output wavelength is equal to or less than 15% of an emission intensity of the output wavelength.

Description

BACKGROUND[0001]1. Technical Field[0002]The invention relates to a light emitting apparatus using various kinds of light emitting devices and an electronic apparatus including the light emitting apparatus.[0003]2. Related Art[0004]In recent years, organic EL (electro luminescence) devices have been formed on a substrate as a light emitting device, and a top emission-type light emitting apparatus that extracts emission light of the light emitting device to the opposite side of the substrate has been widely used as a display apparatus of an electronic apparatus. The top emission scheme is a scheme of interposing a light emitting device, forming a reflecting layer between a first electrode (for example, an anode) on one side formed on a substrate side and a substrate, and extracting light from a second electrode (for example, a cathode) side on the other side interposing the light emitting device, and is a scheme having high utilization efficiency of light.[0005]In the top emission-typ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/52H01L27/32
CPCH01L51/5265H01L27/3206H01L51/5271H10K59/30H10K2102/3026H10K2102/351H10K59/876H10K50/852
Inventor SHIRATORI, KOYA
Owner SEIKO EPSON CORP